Nylon 66 (aka nylon 66, nylon 6/6 or nylon 6,6) is a type of polyamide or nylon. Nylons come in many types, and the two most common for textile and plastics industries are nylon 6 and nylon 66. Nylon 66 is made of two monomers each containing 6 carbon atoms, hexamethylene diamine and adipic acid, which give nylon 66 its name.
Nylon 66 has excellent mechanical properties, high strength, good toughness, and very light, suitable for making parachute, paraglider, etc.
Also nylon 66 has great frictional resistance, good flexibility, is a suitable fabric for hammock.